1. Database may need completely redoing if a single field in one relational table has to be changed.
2. If an ERD is resolved incorrectly then it would have to be redone.
logical reasoning
Circular queues are very efficient and work well with low level codes. Ordinary queues are the standard type of queue but they do not maximize memory data well.
Data Manipulation Language (DML) in SQL, such as SELECT, INSERT, UPDATE, DELETE, allows users to retrieve, modify, and delete data in a database. One advantage of DML is its flexibility in manipulating data, enabling users to perform complex queries and updates. However, a disadvantage is the potential for human error when writing DML statements, which can lead to unintended data modifications or deletions. Additionally, DML operations can impact database performance, especially when dealing with large datasets.
Infinity is the most logical way to say forever.
If done properly there are no disadvantages.
ahsan is the best.
Hi, High level Data modelling is the process of define and analyze the data requirement.
computer are not exact. It is approx
Data Sources
data modelling is used for organising and structuring of data. we can get overview through generic modelling. organising of data means representing the data in such a way that it comes in a particular order via graphical representation.
logical organization
Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.
Entity-Relationship diagrams are useful for modelling data and the relationships between the data. They can be used when the constraints between data are relatively simple. They do not allow specification of interactions between the data or model how the data changes (there are no processes in Entity-Relationship). Entity-Relationship diagrams are most often used to model databases.
Primary partition:you can install additional Operating system (eg:- windows 8, linux etc.)Logical Partition:Just additional drive which can be used to store additional data/ normal files/ software.
A logical unit of data is a virtual representation of data while a physical unit of data is the actual storage of data on a physical device. The logical unit of data is how data is organized and manipulated from a software perspective, while the physical unit of data is how data is stored on hardware such as disks or memory.
A schema separates the physical aspect of data storagefrom the logical aspects of data representation.
The advantages of OODBMS include; extensibility, expressive query language, improved performance, ability to handle many data types, enriched modelling capabilities and support for long transactions. The disadvantages are as follows; lack of standards, lack of experience, competition, compromised encapsulation due to query optimization and lack of a universal data model.